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Biology > Proteins > Flashcards

Proteins Flashcards

1
Q

What is the monomer for proteins?

A

Amino acids

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2
Q

What is the structure of an amino acid?

A 
R
             l
H2N-C -COOH 
             l
            H
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3
Q

What part is different in each amino acid?

A

The R group

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4
Q

What is the bond between the amino acids called?

A

Peptide bond

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5
Q

What do 2 amino acids form?

A

A dipeotide

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6
Q

What do 3 or more amino acids make?

A

A poly peptide

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7
Q

What molecules is the h2o takne from in the condensation reaction?

A

OH from COOH

H from H2N

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8
Q

Where is the peptide bond formed?

A

Between the C and the N

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9
Q

What test is used for protiens?

A

The Biuret test

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10
Q

What is the colour change for a positive result of the biuret test?

A

From blue to lilac

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11
Q

What is Biuret made up from?

A

Sodium hydroxide

Copper sulfate

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12
Q

What is a proteins primary structure?

A

The number and sequence of amino acids in a polypeptide chain

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13
Q

What is the secondary structure of a protein?

A

When the polypeptide chain twists or folds to become a 3D shape

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14
Q

What bonds are formed in a proteins secondary structure?

A

Hydrogen bonds

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15
Q

What are the two types of secondary structure and which is most common?

A

Most common- alpha helix (telephone cord)

Other- beta pleated sheet (zig zag)

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16
Q

What is the tertiary structure of a protein?

A

Further folding and coiling of the secondary structure. It may be a globular protein at this point.

17
Q

Enzymes are at the____________ level of structure and are _____________ proteins

A

Tertiary

Globular

18
Q

What bonds are in the tertiary structure and what are their relative strengths?

A

Hydrogen bonds- weak
Disulfide bridges - relatively strong
Ionic bonds- weaker than disulfide

19
Q

What is the effect of pH on ionic bonds?

A

They are easily broken

20
Q

What is the quaternary structure of a protein?

A

Multiple polypeptide chains and often non-protein (prosthetic) groups

21
Q

Haemoglobin is at __________ level structure

It has ______ based prosthetic groups called a _________ group

A

Quaternary

Iron, haem

22
Q

How can you separate out amino acids?

A

Chromatography

23
Q

Name two types of protiens and give an example of each

A

Globular - enzymes, haemoglobin, hormones

Fibrous - collagen, keretin

24
Q

What function do fibrous protiens normally have?

A

Structural

Biology (1 decks)

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